Pipe-perforator.



c. B. FREDERIGKSON.

PIPE PEBPORATOB.

APPLICATION FILED 0 0158, 1910.

Patented Jan. 23, 1912.

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Patented Jan. 23, 1912.

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PIPE PBRFORATOR.

APPLIOATION FILED 00wv a, 1910.

Patented Jan. 23, 1912.

Immune; l/ 75 p3 g z layionzf ii;'eczeg7ison To all whom it may concern:v

; UNITED sTA'rEs PATENT OFFICE.

CLAYTON E. FBEDEBICKSON, OI GOALINGA, OAIIIFOBNIA.

rrrn-rnnrom'ron.

Be it known that I, CLAYTON E. FREDER- reason, residing at Coalinga, inthe county of Fresno and State'of California, have invented a new andImproved Pipe-Perforator, of which the following is a specification.

My invention relates to the art of pipe perforators and cutters and itparticularly has for its object to provide a device for cutting holes orslots in oil well tubing and the like.

Generically, the invention includes a sup port having grippers to engagethe inner wall of the tubing, and devices for holding thegrippers'inactive; the casing having cutter devices mounted on the same,while a cam carrying plunger operates within the casing to force thecutters outwardly-and.

cause them to penetrate the tubing walls at the desired places. Theplunger also includes means whereby the device may be struck asuccession of blows when the cutters have penetrated the tubeto causethem to cut the slots in the tubing.

In its more detailed nature the invention also resides in those noveldetails of construction, combination and arrangement of parts, all ofwhich will be hereinafter fully described, specifically pointed out inthe appended claims and illustrated in the acc0m panying drawings, inwhich Figure 1, is a perspective view of my invention in use, the welltubing and well being shown in section. Fig. 2, is a central verticallongitudinal section on the line 22 of Fig. 3. Fig. 3, is a crosssection on the line 3-3 of Fig. 2. Fig. 4, is a cross section on theline 4-4 of Fig. 2. Fig. 5, is a cross section on the line 5-5 of Fig.2. Fig. 6, is a cross section on the line 6-6 of Fig. 2. qFig. 7, is adetail perspective view of one of the grippers. Fig. 8, is a detailperspective view of one of the cutters. Fig. 9, is a side elevation ofanother form of my invention, the well tubing and well being shown insection, and the device being lowered into the well ready for setting.Fig. 10, is an enlarged central vertical longitudinal section and partelevation of the de- Specification of Letter: Patent. Patented J an. 23,1912. Application filed October 8, 1910. Serial No. 588,107.

and 13 are cross sections on the lines 11-11, 12-12 and 13--13respectively, on Fi 10.

Referring'now to the accompanying rawings in which like numerals andletters of reference indicate like parts inall the figures, 1 designatesthe casing of my apparatus whose lower portion is reduced by aconi-formed section 2 and further reduced by a cyl-indrical section 3which terminates in a threaded flange 4.

The main body of the casing 1 has an up- 1 ways 10 which aline with theslots 7 "in and into which the radial splines 3.8 of the plunger 36hereinafter again referred to, oper ate.

At its lower end the casing 1 has its central bore reduced as at 12 toreceive a movable armature member 22 whose flange 23 works in the mainbore 1l of the casing 1, as clearly indicated in Fig. 2 of the drawings.

Alining with the slots 7 but not in communication with the same areadditional slots 14 in the coni-formed section 2 of the casing,- whichslotsl ihave undercut edges 15 to form, as it were, a dove-tail in crosssection, the slots 14 merging with openings 13 at the lower end of theconi-form section '2 through which openings the lugs 29 of the grippers26 project.

The cap 16 is internally threaded to'screw onto the threaded end 5 ofthe casing 1 and has a bore 18 toregister with the bore 11 of the casing1.

19 designates a housing for the electromagnet 21, the housing 19 beingsuch as to form with the magnet 21 an iron clad magnet and the housing19 is internally threaded to receive thethreaded flange 4 of the easing1 which'acts as a closure for the housing 19. The housing 19 is providedwith a cross section 20 for the magnet 21 that cooperates with themovable in 'a manner hereinafter more fullyzexplained' 25 'is anadjusting bolt' that is passed through thec'ore 201v and'is threaded mtoa I the grippers 26 being moved upwardly. un-

limited.

with thedove-tailed dove-tailed slots 15.

The grippers 26 have lugs 29 which are.

adapted to be engaged by the flange 23 of the armature 22 and move thegrippers 26 inwardly when the magnet 21 is energized,

der the influence of the spring 30 that is carried on the section 3ofithe casing.

31 designates the cutters whose trunnions 32. lie in the cross slots 6of the casing 1 and are held therein bythe cap 16 when screwed home. Thecutters 31 lie in the slots 7 and they are provided with the penetratingedges 33, the shoulders 34 that engage the shoulders 9 when the cuttersare in their outermost position, and the cutters are further providedwith the cam surfaces 35 that cooperate with the splines 38 of theplunger 36.

The splines 38 have their forward ends beveled as at 39 tocotiperatively engage the cam surfaces 35 of the cutters 31 and movesuch cutters outwardly when the plunger '36 is lowered. The. plunger 36is of cylindrical form and has radial recesses 37 to receive the splines38 which snugly fit in such recesses and operate in the grooves 10 ofthe casing 1. The plunger 36 is also formed with a head 40 that isadapted'at' times to'rest'against the upper end of the cap 16 and theplunger 36 is continued above the head 40 and terminates in a threadedunion 41 to which the wellrod is connected electric energy to pass intothe magnet 21 to energize the same, the energy entering into leadlngwires 42 from any suitable source of supply. The energization of themagnet 21 causes the armature 22 to' draw in, thereby moving thegrippers 26 downwardly and inwardly toward the central longitudinal axis7 of the device. The apparatus is then lowered into the well asindicated inFig'. 1 of the drawings. Inasmuch as the casing 1 and itsattached parts are suspend from .theplunger 36, the plunger 36 will movewith itsf'head 40 away from the cap16 and consequently permit thecutters to liewithin the bounds-of the casing. I. As soon asthe'devicehasbeen lowered to' the proper place the energy of the magnet21 is cut ofi,

thereby releasing the armature 22 and permitting the grippers 26 to beforced upwardly and outwardly by the spring 30. This causes the grippers26 to en age the walls of the well and theweight o the apparatus willthen assist the spring 30 in holding the grippers 26 in engagement withthe well walls. The plunger 36 is next lowered untilthe head 40 engagesthe cap 16. This movement causes the splines 38 to travel downwardlyuntil the cutters-31 are forced outwardly into en agement with the welltubing and penetratmg the wall there-- of. Should it be desired to slotthe well walls after the cutters 31 have been forced through the wellwalls the magnet is again energized, thus releasing the grippers 26 fromengagement with the well wall and by reciprocating the plunger 36 andcausing its head 40 to impact the cap 16, the apparatus can be forceddownwardly while the cutters 31 are extended and thereby slit the welltubing through as long a distance as may be required. To remove theapparatus from the well, it is only necessary to pull up on the plunger36when the device will readily disengage itself from the well walls andcan then be easily withdrawn.

In Figs. 9 et seq., I have disclosed another form of my invention inwhich the electromagnetic setting mechanism is done away with andmechanical devices substituted in lieu thereof. 1

By referring nowl more particularly to Figs. 9, et seq. it will be seenthat the casing 44 of this form of my invention is centrally bored fromits upper end as at 45 which bore is enlarged or counter-bored at 46 andtapped at 47 at its lower end. The casing 44 is slotted at 48 to receivethe cutters 50, the upper end of the slots 48 being concaved as at 49'toreceive the convexed ends 52 of the cutters 50, the cutters 50 havlngshoulders 51 to limit their outward movement and having portions 51 toenter the longitudinal slots 54 of the plunger 53 WlllCll works in thebore 45 with its head 56 operating in the counter-bore 46 of the casing44.. At its lower end the plunger 53 has its slots 54 deepened to forminclines 55 so that the cutters 50 may close into the casing 44 when theplunger 53 is drawn upwardly with respect to the casing. The plunger 53is'threaded at 57 at its upper end to fit into a threaded opening 58 ofthe collar 59 of the cap 60, to which. cap at 61- a swivel joint forthesuspendmg cable may be attached. 62 designates a gripper head orspear which has a threaded projection-.63 to thread into the threadedend 47 of the casing 44 and form a closure and slotted through, as at 66to receivea connecting pin 68 of the grippers '67 which have a ton ueand groove sliding connection 69 with the head 62, as indicated, itbeing understood that the pin 68 may be fastened to one of the grippers67 and slide loosely in a hole in the other gripper so that thegripper-s67 may separate ordraw together as they are moved in onedirection or the otherby't-he pins 70 or 76 as the case may be. The pin70 projects into the slot 64: from its lower end and is cut away as at($7 to pass the dowel 79. that limits the movement of the pin 70 in thebore 64. 75 is a coil leaf spring which is pierced at its ends andmiddle by the pins 70 and is loosely slidable thereon. the movementof'the spring 75 being limited in one direction by a collar 74 of thepin70 and adapted to be retained in a definite position by, the latchdevice 73 at times. it being understood that the transverse or spreadingdimension of the spring 75 is greater than that of the head (32 orcasing 44 so as to frictionally engage the wall of the well tubing whenthe tool is being lowered into the well tube. In operating this form ofmy invention the spring 75 is released from engagement with the pawl 73and moved above such pawl, the pin 70 being drawn down to its lowestposition permitting the pins 76 to be moved down with the grippersinwardly away from the wall of the well tubing. At this time also thecasing 44 will be suspended on the plunger 52 whose head 56 will at thistime be at the uppermost limit of the counter-bore 4t, so that thecutters will locate in the depressimls of the plunger and come withinthe external boundaries of the casing H. The device is lowered into thewell. The spring 75 frictionally engages the walls of the well tube butinasmuch as it has free movement on the pin and being above the latch 73as shown in Fig. 9 it will not disturb the position of the pin 70. Thetool having .been lowered to the desired position, the operator startstoraise up on the tool. As the tool is raised, the spring 75 being infrictional engagement with the. well tube, will slide down on the pin 70until it passes the latch 73 by which it will be retained. As soon asthe spring 75 has passed latch 73, the operator relieves the suspendingcable to lower the device, whereupon the pin 70 being held stationary bythe sprin 7 5 will move the pin 68 upwardly thereby timing the grippers67 upwardly and outwardly to engage the wall of the well. As soon as thegrippers 67 engage the well wall the weight of the device will besufficient to hold the grippers against the well wall owing to theirserrated faces. Lowering of the suspending cable after the grippers 67have caught, causesthe plunger 55 to travel downwardl in the casing 44,thereby forcing the cutters 50 outwardly,

, thereby causing them to penetrate the walls of the well tubing W andmake the required cut. A further lowering of the plunger 55 causes thehead 56 to engage the pin' 76 and release the grippers 67, thus allowingan iu'lpacting action to be imparted to the casing and force the cutters50 downwardly to slit the well tube W, as will be clearly understood byreference to the drawings 'lo remove the device fl'Olllillt. well it isonly necessary to draw up on the suspending cable whcn the plunger 55will extend out of the casing 44 and permit the cutters movin into thecasin as the casin 44 is b P '3 grippers (57 will be released.

From the foregoing description, taken in connection with theaccompanying drawings, it is thought the complete construction,operation and advantages of my invention will be readily apparent.

What I claim is:

ljln a. device of the class described, a ('rasing.'a cutter mounted insaid casing, said pulled upwardly and at the same time the casing havingan opening through which said cutter may be projected, andreciprocablemeans operating within said casing for forcing said cutterout of said casing, means at the bottom of said casing for sustainingsaid casing in a well tube and means forming a part of said reciprocablemeans for imparting said casing when said rcciprocable means isrcciprocated after said cutter has been forced out of the casing, tocause said cut-terto cut a slit. v

In a device of the class described. a casing, a cutter mounted in saidcasing, said casing having an opening through which said cutter may beprojected. and recipro- -abie means operating within said casing forforcing said cutter out of said casing, and means for impacting saidcasing-to cause said cutter to cut a slit.

3. In a device of the class described, a casing, a cutter mounted insaid casing, said :asmg having an opening through which said cutter maybe prt'ijccted. and reciprocable means o wrating within said casing forforcing said cutter out of said casing, means at the bottom of saidcasing for sustaining said casing in a well tube, and means governed bysaid reciprocating means for releasing said sustaining means, and animpacting member carried by said recipro-- cable means for impacting thecasing and tl'iereby forcing said casing downwardly to cause saii'lcutter tcslit. the well tube.

4. In a well perforating apparatus, a casing, a plunger reciprocablein'said casing and projecting through one end of said. casing, means forlimitin thermovementof said plunger out of sa d casing, a cutter mountedin said casing, said plunger havin a grgovej nto wh ch sald cutter proects, sa1

plunger having a pocket merging with said groove, m wlnch said cuttermay lie when said-plunger and easing are extended, said ing, means for.limiting the movement of said plunger out of said casing, a cuttermounted in said casing, said plunger having a groove into which saidcutter projects, said plunger having a pocket merging with said groovein which said cutter may lie when said plunger and easing are extended,said plunger serving to force said cutter out of said casing toperforate the well wall when said plunger is telescoped into saidcasing, and gripper devices carried by said casing for engaging the wellwall to sustain said casing in position.

6. In a well perforating apparatus, a casing, a plunger reciprocable insaid casing and projecting through one end of said casing, means forlimiting the movement of said plunger out of said casing, a cuttermounted in said casing, said plunger having a groove into which saidcutter projects, said plunger having a pocket merging with said groove,in which said cutter may lie when said plunger and easing are extended,said plunger serving to force said cutter out of said casing toperforate the well wall when said plunger is telescoped into saidcasing, and means for'holding said casing in position in the well tubewhile said cutter is be ingeforced outwardly to penetrate the well tuand means controlled by said plunger for releasing said sustaining meansto permit said casing to be moved downwardly while said cutter isextended to slit the well tube. 7. In a well perforating apparatus, acasmg, a plunger reciprocable in said casing and projecting through oneend of said casing, means for limiting the movement-of said plunger outof said casing, a cutter mounted in said casing, said plunger having agroove into which said cutter projects,

,saidplunger having a pocket merging with said groove in which saidcutter may liewhen said plunger and casing are extended,

said plunger serving to force said cutter out of. said-casing toperforate the well wall when said plunger is telescoped into saidcasing, and gripper devices'carried by said casing for engaging the wellwall to sustain said casing in position, and means controlled by saidplunger for releasing the said gri pers at times to permit said casingto e driven downwardly to cause said cutterto slit the well tube.

8. In a well tube perforating device, a casing, a plunger telescopicallymounted in said casing, and adapted to be extended out of said casing,means for limiting the outward movement of said plunger, a cuttermounted within said casing, sald casing having an opening through whichsaid cutter is adapted to project, means carried by said plunger forforcing said cutter through said opening when said plunger is telescopedinto said casing, gripping devices carried by said casing for engagingthe well tube wall to retain said casing in position, andmeanscontrolled by said plunger for releasing said gripping devicesafter said cutter has penetrated the well wall.

9. In a well tube perforating device, a casing, a plunger telescopicallymounted in said casing, and adapted to be extended out of said casing,means for limiting the outward movement of said plunger, a cuttermounted within said casing, said casing having an opening through whichsaid cutter is adapted to project, means carried by said plunger forforcing said cutter through said opening when said plunger is telescopedinto said casing, gripping devices carried by said casingfor engagingthe well tube wall to I retain said casing in position, and meanscontrolled by said plunger for releasing said gripping devices aftersaid cutter has penetrated the well wall, and other means for holdingsaid gripping devices inactive while said casing-is belng lowered intothe well tube.

10. In a well tube perforating device a casing, a plunger telescopicallymounted 111 said casing, and adapted to be extended out of said casing,means for limiting the outward movement of said plun er, a cuttermounted within said casing,- sai casing having an opening through whichsaid cutter is adapted to project, means carried by said plunger for.forcing said cutter through said opening when said plunger is telescopedinto said casing, gripping devices carried by said casing for engagingthe well tube wall to retain said casing in position, and other meansfor holding said gripping devices mactive while said casing is beinglowered into the well tube. i

llnln awell tube perforating device a casing,a plunger telescopicallymounted in said casing, and adapted to be extended outof said casing,means for limiting the outward movement of said" plunger, a cuttermounted within said casing, said casing having an opening through whichsaid cutter is adapted to project, means carried. by said plunger forforcing said cutter throu h 1 0' said opening when said plunger is teeseoped into said easing, gripping devices tuated mechanism for engagingsaid gripeiu-ried by said casing for engaging the well ping devices tohold them in their mopcratube wall to retuin said casing in position,live position.

and other means for holding said gripping CLAYTON E. FREDERIGKSON.(leviees inactive while said caslng 1s being Witnesses: i lowered intothe well lube, said last named J. M. I'IAYDIGN,

means comprising e1eetionmgnetically :i(:-' W. b. SMULLIN.

